(10 marks) Perform pencil-marking (candidates) for cells in row 1 and block 1 (top-left 3x3). Present candidates succinctly.
You have three minutes, the voice said. Then the recursion loop begins. sudoku 129
If you notice that two squares within the same row, column, or box contain the exact same pair of candidate numbers (for example, both cells only have the options [2, 7] ), you have found a Naked Pair. While you do not know which square is 2 and which is 7, you know with absolute certainty that those two numbers must occupy those two cells. Therefore, you can safely eliminate 2 and 7 from the candidate lists of all other cells in that same row, column, or box. The same logic applies to Naked Triples (three cells sharing three candidates). Pointing Pairs (10 marks) Perform pencil-marking (candidates) for cells in
: A specialized collection that includes advanced constraints like Killer Cages even/odd shaded cells , and diagonal restrictions. Essential Rules for Sudoku 129 Variants Constraint Every row, column, and 3x3 box must contain digits 1–9. Diagonal (X) Digits 1–9 cannot repeat on the two main diagonals. Killer Cages Then the recursion loop begins
While "Sudoku 129" isn't a world-famous brand name, it is a specialized corner of the puzzle world known for its customizable digital booklets
Every Sudoku puzzle starts with a set of pre-filled numbers called "givens." Use these givens to unlock the rest of the grid using basic logic. 1. Cross-Hatching (Scanning)